It was a software application designed to install IPA files onto iOS devices. This process, known as sideloading, allowed users to install applications that were not available through the official App Store. For instance, one could use the tool to install modified versions of applications or older, unsupported versions.
The utility played a significant role in the iOS jailbreaking community and app development. It provided a method for developers to test their applications on physical devices before submitting them to the App Store. It also offered a workaround for users seeking functionality beyond the confines of the standard iOS ecosystem, though such practices carried security risks and potential warranty implications.